Docker为网络bridge模式指定容器ip的方法
投稿：daisy
Docker在创建容器时有四种网络模式，bridge为默认不需要用--net去指定，其他三种模式需要在创建容器时使用--net去指定。那Docker为网络bridge模式指定容器ip该如何实现呢？下面通过通过这篇文章一起看看吧，文中给出了详细的示例代码，有需要的可以参考借鉴。
前言
众所周知bridge模式是Docker默认的网络设置，此模式会为每一个容器分配Network Namespace、设置IP等，并将一个主机上的Docker容器连接到一个虚拟网桥上。下面来看看Docker为网络bridge模式指定容器ip的方法。
实现方法
如果只是简单创建一个bridge模式的网络是无法给容器指定ip的
[root@vultrvpn conf.d]# docker network create --driver bridge wordpress_net ad1ff3d972e8bfe6d992a8403a98f46784aa75d5514adbf35ee6ae4528513be7 [root@vultrvpn conf.d]# docker network ls NETWORK ID NAME DRIVER SCOPE 38fab5c74b87 bridge bridge local f0cf94dd0c5e host host local 465a31c55aa1 none null local ad1ff3d972e8 wordpress_net bridge local
已创建一个wordpress_net的网络，在这个网络模块上创建一个容器，并指定ip
[root@vultrvpn conf.d]# docker run -d --name db_mysql -m 220m --memory-swap 220m -v /data/docker_project/db_mysql/data:/var/lib/mysql -v /data/docker_project/db_mysql/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=qwe123 --network=wordpress_net --ip=172.18.0.2 mysql:5.7 da497e56bd4b0f3434dd4f81534096574d167354dc508b657ceb390ba8e63771 docker: Error response from daemon: User specified IP address is supported only when connecting to networks with user configured subnets.
提示了一个错误，若要配置ip，则需要给这个网络指定一个subnet。所以重新搞一个网络。
docker network create --driver bridge --subnet 172.25.0.0/16 wordpress_net
[root@vultrvpn conf.d]# docker network inspect wordpress_net
[
{
"Name": "wordpress_net",
"Id": "925e64493df9b674ef9bdadaae380c8a335aa6353e48b447cb5d910df19c3a3e",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.25.0.0/16"
}
]
},
"Internal": false,
"Containers": {},
"Options": {},
"Labels": {}
}
]
在给容器指定一个ip
[root@vultrvpn conf.d]# docker run -d --name my_vpn -m 100m --memory-swap 100m -e WORDPRESS_DB_HOST=172.25.0.2 -e WORDPRESS_DB_USER=root -e WORDPRESS_DB_PASSWORD=qwe123 -e WORDPRESS_DB_NAME=myvpn -p 8001:80 --network=wordpress_net wordpress:4.6 096518d84419476f71647a8c70c91c3f336ef8772af50672b88a9c1fd7b3a719 [root@vultrvpn conf.d]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 096518d84419 wordpress:4.6 "/entrypoint.sh apach" 47 seconds ago Up 47 seconds 0.0.0.0:8001->80/tcp my_vpn 6d23ed99db20 wordpress:4.6 "/entrypoint.sh apach" About a minute ago Up About a minute 0.0.0.0:8000->80/tcp my_wordpress ade42edf5a93 mysql:5.7 "docker-entrypoint.sh" 3 minutes ago Up 3 minutes 3306/tcp db_mysql
正常创建
查看网卡信息
[root@vultrvpn conf.d]# docker network inspect wordpress_net
[
{
"Name": "wordpress_net",
"Id": "925e64493df9b674ef9bdadaae380c8a335aa6353e48b447cb5d910df19c3a3e",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.25.0.0/16"
}
]
},
"Internal": false,
"Containers": {
"096518d84419476f71647a8c70c91c3f336ef8772af50672b88a9c1fd7b3a719": {
"Name": "my_vpn",
"EndpointID": "e44636c2b3a49d4aedaad68cd6ca17aea3a9fe4f71afecb27219a6412701536a",
"MacAddress": "02:42:ac:19:00:04",
"IPv4Address": "172.25.0.4/16",
"IPv6Address": ""
},
"6d23ed99db20f17d99dd5dcf6cc65f5ced8cb936917dee044914cf278179150c": {
"Name": "my_wordpress",
"EndpointID": "3c765d5953428c1d66be584eb0d34b58f6eee3f598e3a37263d54d77e2b87263",
"MacAddress": "02:42:ac:19:00:03",
"IPv4Address": "172.25.0.3/16",
"IPv6Address": ""
},
"ade42edf5a934b02f7bb741bd5a45a282a50d3a49e9f1866579e8f93fef22a0e": {
"Name": "db_mysql",
"EndpointID": "2322bfb9da72b3b6db68d59cea97172e66b960ca5b782bd2fa7d09f9c93f0288",
"MacAddress": "02:42:ac:19:00:02",
"IPv4Address": "172.25.0.2/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家能有所帮助，如果有疑问大家可以留言交流。